Members of congress react as U.S. President Donald Trump addresses a joint session of the U.S. Congress on February 28, 2017 in the House chamber of the U.S. Capitol in Washington, DC. Trump's first address to Congress focused on national security, tax and regulatory reform, the economy, and healthcare. (Photo by Alex Wong/Getty Images)

President Trump delivered his first address before a joint session of Congress on Tuesday night, and a group of congresswomen dressed in all white to send him a message and pay tribute to the legacy of the women’s movement. The coordinated effort was a tribute to the suffragettes, who nearly 100 years fought for and won the right to vote with 19th Amendment. The move continued a trend started by Hillary Clinton during the 2016 race — she wore an all-white pantsuit during her keynote speech at the Democratic National Convention, where she officially accepted the party’s presidential nomination. And, NBC News reported, on Election Day, many women visited the polls wearing all white, and posted about doing so on social media using the #WearWhiteToVote hashtag.

On Tuesday night, the group, including former House Speaker Nancy Pelosi, was a sight to behold inside the Congressional chamber decked out in all dazzling white attire.

“We wear white to unite against any attempts by the Trump Administration to roll back the incredible progress women have made in the last century, and we will continue to support the advancement of all women,” Lois Frankel, a Democratic representative from Florida and the chair of the party’s Women’s Working Group, said in a statement, according to NBC News.

Prior to the speech, the congresswomen posted photos on Twitter showing off their wardrobes for the evening.

“I’m wearing suffragette white for Trump’s #JointSession in honor of the generations of women who marched & fought for our sacred rights,” Barbara Lee, a representative from California posted on Twitter alongside a photo of herself on the steps of the Capitol building, ahead of the event. Nancy Pelosi also posted a group shot on Twitter prior to the address.

With women’s issues looming large in the early days of the Trump presidency, the group was there to remind the president that he would face opposition on issues important to them. Throughout the speech, the women members of Congress mostly remained seated and booed Trump on occasion, and could be seen giving him the thumbs down sign at least once.